Not necessarily. Maybe Hitler was indeed messed up in the head. But he pretty much single handedly unified an entire nation out of its depression. So, you can't call him unintelligent.

I wasn't referring to his ability or achievements, or intelligence. I think it's unethical to honour a man so lacking in human virtue.

Besides, he was an exceptional orator and leader, but it was Bismarck who set the groundwork. The German National Assembly failed however many years earlier, but Bismarck was smart enough that words alone wouldn't be enough to unify the German states, and the Prussia-Austria and Prussian-Franco wars were the rallying points for the states. 'Blood and iron' and what-not. His memoirs were a very interesting read. It's rare that such people actually... retire.